Christina Applegate has revealed that being pregnant has changed her behaviour.

In an appearance on the Late Show with David Letterman , the actress - who announced last month that she is expecting her first child - admitted to losing her temper because of changing hormones.

"I have no filter anymore. Stuff comes out to strangers. I've always been really kind and... a people pleaser," she said.

"The other day, my girlfriend took me to the bank. We pulled up really close to the ATM. It was really hot. I didn't want to have to walk. I mean, I'm pregnant for crying out loud! I don't need to walk."

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She added that she became irate after a parking attendant asked her friend to move the car.

"I was just like, 'Shhhhh! Shhhhh! It is too hot out to be a douchebag, OK?!'" she laughed.

"What's wrong with me? I was like, 'Who am I right now?! That's a horrible thing to say to somebody!'"

Applegate recently claimed that her parenting style would be mixed between strict and easy-going.